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private string ContentTransformation(string _xmlContent, string _xsltScheme)
        {
            try
            {
                XmlReaderSettings xmlRS = new XmlReaderSettings();
                XPathDocument doc = new XPathDocument(XmlReader.Create(new StringReader(_xmlContent), xmlRS));
                XPathNavigator nav = doc.CreateNavigator();
                XmlReader reader = XmlReader.Create(new StringReader(nav.OuterXml));
                reader.MoveToContent();

                System.IO.StringReader strRead = new StringReader(_xsltScheme);

                XslCompiledTransform xslt = new XslCompiledTransform();
                xslt.Load(XmlReader.Create(strRead));

                // Transform the node fragment. 
                StringWriter strW = new StringWriter();
                XmlWriterSettings wrSet = new XmlWriterSettings();
                wrSet.ConformanceLevel = ConformanceLevel.Auto;
                XmlWriter xmlW = XmlWriter.Create(strW, wrSet);

                xslt.Transform(reader, xmlW);
                xmlW.Close();

                return strW.ToString();
            }
            catch (ArgumentNullException anEx)
            {
                return "XSL преобразование не выполнено!<br>Параметр равен null.<br>" + anEx.Message;
            }
            catch (XsltException xsltEx)
            {
                return "XSL преобразование не выполнено!<br>Проверте XSL схему.<br>" + xsltEx.Message;
            }
            catch (Exception ex)
            {
                return ex.Message;
            }
        }